TY - RPRT TI - Oblique synoptic images, produced from digital data, display strong evidence of a "new" caldera in southwestern Guatemala AU - W. Duffield AU - G. Heiken AU - D. Foley AU - A. McEwen PY - 1993 UR - https://pubs.usgs.gov/publication/70018325 ID - 70018325 ER -